Honestly, I wouldn't know. I can however say that maybe a blog like you suggested or a website would be good, somewhere where you could display and maybe put up some of your pieces for auction, I'm sure there are people willing to pay for most of your works. Oh, and a bigger or more pronounced watermark would help, maybe use StTheo in full searching T.S. isn't very specific and it doesn't help people find you. But what do I know anyway.
After looking at a lot of these concepts, I start to notice that a lot of the solders and robots look a bit like the ones from metal gear solid 4/revengence. Not saying that's a bad thing or anything, I think the designs are awesome!